题目内容：

语篇补全

Do you often feel sleepy in class? Maybe you should move your smartphones and tablets (平板电脑) away from your bed at night.

If kids use electronic devices (电子产品) at bedtime, they may have poor sleep. A new study by BBC found this. A smartphone or a tablet can make you excited.1.The devices also give out a special “blue light”. 2.

According to the study, 89 percent of US teenagers have at least one device near their bed. 3. “Kids should stop looking at electronic devices at least 30 minutes before bedtime,” says the study. 4.You can also keep a diary or drink some milk before sleep. That also helps you sleep better.

 

A. The blue light stops you from sleeping.

B. Nobody should use the phone before bedtime.

C. This means it will take you much more time to fall asleep.

D. That way, your brain can slow down and get ready for sleep.

E. And most of them use their devices before bedtime.